mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
276 lines
9.9 KiB
Go
276 lines
9.9 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package handlers
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import (
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"context"
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"fmt"
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"net/http"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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metav1beta1 "k8s.io/apimachinery/pkg/apis/meta/v1beta1"
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"k8s.io/apimachinery/pkg/apis/meta/v1beta1/validation"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
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"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
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utiltrace "k8s.io/utils/trace"
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)
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// transformObject takes the object as returned by storage and ensures it is in
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// the client's desired form, as well as ensuring any API level fields like self-link
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// are properly set.
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func transformObject(ctx context.Context, obj runtime.Object, opts interface{}, mediaType negotiation.MediaTypeOptions, scope *RequestScope, req *http.Request) (runtime.Object, error) {
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if co, ok := obj.(runtime.CacheableObject); ok {
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if mediaType.Convert != nil {
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// Non-nil mediaType.Convert means that some conversion of the object
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// has to happen. Currently conversion may potentially modify the
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// object or assume something about it (e.g. asTable operates on
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// reflection, which won't work for any wrapper).
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// To ensure it will work correctly, let's operate on base objects
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// and not cache it for now.
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//
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// TODO: Long-term, transformObject should be changed so that it
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// implements runtime.Encoder interface.
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return doTransformObject(ctx, co.GetObject(), opts, mediaType, scope, req)
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}
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}
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return doTransformObject(ctx, obj, opts, mediaType, scope, req)
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}
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func doTransformObject(ctx context.Context, obj runtime.Object, opts interface{}, mediaType negotiation.MediaTypeOptions, scope *RequestScope, req *http.Request) (runtime.Object, error) {
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if _, ok := obj.(*metav1.Status); ok {
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return obj, nil
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}
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if err := setObjectSelfLink(ctx, obj, req, scope.Namer); err != nil {
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return nil, err
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}
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switch target := mediaType.Convert; {
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case target == nil:
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return obj, nil
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case target.Kind == "PartialObjectMetadata":
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return asPartialObjectMetadata(obj, target.GroupVersion())
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case target.Kind == "PartialObjectMetadataList":
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return asPartialObjectMetadataList(obj, target.GroupVersion())
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case target.Kind == "Table":
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options, ok := opts.(*metav1.TableOptions)
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if !ok {
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return nil, fmt.Errorf("unexpected TableOptions, got %T", opts)
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}
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return asTable(ctx, obj, options, scope, target.GroupVersion())
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default:
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accepted, _ := negotiation.MediaTypesForSerializer(metainternalversionscheme.Codecs)
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err := negotiation.NewNotAcceptableError(accepted)
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return nil, err
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}
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}
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// optionsForTransform will load and validate any additional query parameter options for
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// a conversion or return an error.
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func optionsForTransform(mediaType negotiation.MediaTypeOptions, req *http.Request) (interface{}, error) {
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switch target := mediaType.Convert; {
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case target == nil:
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case target.Kind == "Table" && (target.GroupVersion() == metav1beta1.SchemeGroupVersion || target.GroupVersion() == metav1.SchemeGroupVersion):
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opts := &metav1.TableOptions{}
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if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), metav1.SchemeGroupVersion, opts); err != nil {
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return nil, err
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}
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switch errs := validation.ValidateTableOptions(opts); len(errs) {
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case 0:
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return opts, nil
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case 1:
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return nil, errors.NewBadRequest(fmt.Sprintf("Unable to convert to Table as requested: %v", errs[0].Error()))
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default:
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return nil, errors.NewBadRequest(fmt.Sprintf("Unable to convert to Table as requested: %v", errs))
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}
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}
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return nil, nil
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}
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// targetEncodingForTransform returns the appropriate serializer for the input media type
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func targetEncodingForTransform(scope *RequestScope, mediaType negotiation.MediaTypeOptions, req *http.Request) (schema.GroupVersionKind, runtime.NegotiatedSerializer, bool) {
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switch target := mediaType.Convert; {
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case target == nil:
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case (target.Kind == "PartialObjectMetadata" || target.Kind == "PartialObjectMetadataList" || target.Kind == "Table") &&
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(target.GroupVersion() == metav1beta1.SchemeGroupVersion || target.GroupVersion() == metav1.SchemeGroupVersion):
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return *target, metainternalversionscheme.Codecs, true
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}
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return scope.Kind, scope.Serializer, false
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}
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// transformResponseObject takes an object loaded from storage and performs any necessary transformations.
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// Will write the complete response object.
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func transformResponseObject(ctx context.Context, scope *RequestScope, trace *utiltrace.Trace, req *http.Request, w http.ResponseWriter, statusCode int, mediaType negotiation.MediaTypeOptions, result runtime.Object) {
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options, err := optionsForTransform(mediaType, req)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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obj, err := transformObject(ctx, result, options, mediaType, scope, req)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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kind, serializer, _ := targetEncodingForTransform(scope, mediaType, req)
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responsewriters.WriteObjectNegotiated(serializer, scope, kind.GroupVersion(), w, req, statusCode, obj)
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}
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// errNotAcceptable indicates Accept negotiation has failed
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type errNotAcceptable struct {
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message string
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}
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func newNotAcceptableError(message string) error {
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return errNotAcceptable{message}
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}
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func (e errNotAcceptable) Error() string {
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return e.message
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}
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func (e errNotAcceptable) Status() metav1.Status {
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return metav1.Status{
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Status: metav1.StatusFailure,
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Code: http.StatusNotAcceptable,
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Reason: metav1.StatusReason("NotAcceptable"),
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Message: e.Error(),
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}
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}
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func asTable(ctx context.Context, result runtime.Object, opts *metav1.TableOptions, scope *RequestScope, groupVersion schema.GroupVersion) (runtime.Object, error) {
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switch groupVersion {
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case metav1beta1.SchemeGroupVersion, metav1.SchemeGroupVersion:
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default:
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return nil, newNotAcceptableError(fmt.Sprintf("no Table exists in group version %s", groupVersion))
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}
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obj, err := scope.TableConvertor.ConvertToTable(ctx, result, opts)
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if err != nil {
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return nil, err
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}
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table := (*metav1.Table)(obj)
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for i := range table.Rows {
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item := &table.Rows[i]
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switch opts.IncludeObject {
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case metav1.IncludeObject:
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item.Object.Object, err = scope.Convertor.ConvertToVersion(item.Object.Object, scope.Kind.GroupVersion())
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if err != nil {
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return nil, err
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}
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// TODO: rely on defaulting for the value here?
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case metav1.IncludeMetadata, "":
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m, err := meta.Accessor(item.Object.Object)
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if err != nil {
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return nil, err
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}
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// TODO: turn this into an internal type and do conversion in order to get object kind automatically set?
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(groupVersion.WithKind("PartialObjectMetadata"))
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item.Object.Object = partial
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case metav1.IncludeNone:
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item.Object.Object = nil
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default:
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err = errors.NewBadRequest(fmt.Sprintf("unrecognized includeObject value: %q", opts.IncludeObject))
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return nil, err
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}
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}
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return table, nil
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}
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func asPartialObjectMetadata(result runtime.Object, groupVersion schema.GroupVersion) (runtime.Object, error) {
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if meta.IsListType(result) {
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err := newNotAcceptableError(fmt.Sprintf("you requested PartialObjectMetadata, but the requested object is a list (%T)", result))
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return nil, err
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}
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switch groupVersion {
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case metav1beta1.SchemeGroupVersion, metav1.SchemeGroupVersion:
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default:
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return nil, newNotAcceptableError(fmt.Sprintf("no PartialObjectMetadataList exists in group version %s", groupVersion))
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}
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m, err := meta.Accessor(result)
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if err != nil {
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return nil, err
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}
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(groupVersion.WithKind("PartialObjectMetadata"))
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return partial, nil
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}
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func asPartialObjectMetadataList(result runtime.Object, groupVersion schema.GroupVersion) (runtime.Object, error) {
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li, ok := result.(metav1.ListInterface)
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if !ok {
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return nil, newNotAcceptableError(fmt.Sprintf("you requested PartialObjectMetadataList, but the requested object is not a list (%T)", result))
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}
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gvk := groupVersion.WithKind("PartialObjectMetadata")
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switch {
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case groupVersion == metav1beta1.SchemeGroupVersion:
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list := &metav1beta1.PartialObjectMetadataList{}
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err := meta.EachListItem(result, func(obj runtime.Object) error {
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m, err := meta.Accessor(obj)
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if err != nil {
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return err
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}
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(gvk)
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list.Items = append(list.Items, *partial)
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return nil
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})
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if err != nil {
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return nil, err
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}
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list.SelfLink = li.GetSelfLink()
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list.ResourceVersion = li.GetResourceVersion()
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list.Continue = li.GetContinue()
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return list, nil
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case groupVersion == metav1.SchemeGroupVersion:
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list := &metav1.PartialObjectMetadataList{}
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err := meta.EachListItem(result, func(obj runtime.Object) error {
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m, err := meta.Accessor(obj)
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if err != nil {
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return err
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}
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(gvk)
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list.Items = append(list.Items, *partial)
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return nil
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})
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if err != nil {
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return nil, err
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}
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list.SelfLink = li.GetSelfLink()
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list.ResourceVersion = li.GetResourceVersion()
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list.Continue = li.GetContinue()
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return list, nil
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default:
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return nil, newNotAcceptableError(fmt.Sprintf("no PartialObjectMetadataList exists in group version %s", groupVersion))
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}
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}
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